fs/nfs/pnfs.h

   1 /*
   2  *  pNFS client data structures.
   3  *
   4  *  Copyright (c) 2002
   5  *  The Regents of the University of Michigan
   6  *  All Rights Reserved
   7  *
   8  *  Dean Hildebrand <dhildebz@umich.edu>
   9  *
  10  *  Permission is granted to use, copy, create derivative works, and
  11  *  redistribute this software and such derivative works for any purpose,
  12  *  so long as the name of the University of Michigan is not used in
  13  *  any advertising or publicity pertaining to the use or distribution
  14  *  of this software without specific, written prior authorization. If
  15  *  the above copyright notice or any other identification of the
  16  *  University of Michigan is included in any copy of any portion of
  17  *  this software, then the disclaimer below must also be included.
  18  *
  19  *  This software is provided as is, without representation or warranty
  20  *  of any kind either express or implied, including without limitation
  21  *  the implied warranties of merchantability, fitness for a particular
  22  *  purpose, or noninfringement.  The Regents of the University of
  23  *  Michigan shall not be liable for any damages, including special,
  24  *  indirect, incidental, or consequential damages, with respect to any
  25  *  claim arising out of or in connection with the use of the software,
  26  *  even if it has been or is hereafter advised of the possibility of
  27  *  such damages.
  28  */
  29
  30 #ifndef FS_NFS_PNFS_H
  31 #define FS_NFS_PNFS_H
  32
  33 #include <linux/refcount.h>
  34 #include <linux/nfs_fs.h>
  35 #include <linux/nfs_page.h>
  36 #include <linux/workqueue.h>
  37
  38 struct nfs4_opendata;
  39
  40 enum {
  41         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
  42         NFS_LSEG_ROC,           /* roc bit received from server */
  43         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
  44         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
  45         NFS_LSEG_UNAVAILABLE,   /* unavailable bit set for temporary problem */
  46 };
  47
  48 /* Individual ip address */
  49 struct nfs4_pnfs_ds_addr {
  50         struct sockaddr_storage da_addr;
  51         size_t                  da_addrlen;
  52         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  53         char                    *da_remotestr;  /* human readable addr+port */
  54 };
  55
  56 struct nfs4_pnfs_ds {
  57         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  58         char                    *ds_remotestr;  /* comma sep list of addrs */
  59         struct list_head        ds_addrs;
  60         struct nfs_client       *ds_clp;
  61         refcount_t              ds_count;
  62         unsigned long           ds_state;
  63 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
  64 };
  65
  66 struct pnfs_layout_segment {
  67         struct list_head pls_list;
  68         struct list_head pls_lc_list;
  69         struct pnfs_layout_range pls_range;
  70         refcount_t pls_refcount;
  71         u32 pls_seq;
  72         unsigned long pls_flags;
  73         struct pnfs_layout_hdr *pls_layout;
  74 };
  75
  76 enum pnfs_try_status {
  77         PNFS_ATTEMPTED     = 0,
  78         PNFS_NOT_ATTEMPTED = 1,
  79         PNFS_TRY_AGAIN     = 2,
  80 };
  81
  82 #ifdef CONFIG_NFS_V4_1
  83
  84 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  85
  86 /*
  87  * Default data server connection timeout and retrans vaules.
  88  * Set by module parameters dataserver_timeo and dataserver_retrans.
  89  */
  90 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  91 #define NFS4_DEF_DS_RETRANS 5
  92 #define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
  93
  94 /* error codes for internal use */
  95 #define NFS4ERR_RESET_TO_MDS   12001
  96 #define NFS4ERR_RESET_TO_PNFS  12002
  97
  98 enum {
  99         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
 100         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
 101         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
 102         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
 103         NFS_LAYOUT_RETURN_LOCK,         /* Serialise layoutreturn */
 104         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
 105         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 106         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 107         NFS_LAYOUT_INODE_FREEING,       /* The inode is being freed */
 108 };
 109
 110 enum layoutdriver_policy_flags {
 111         /* Should the pNFS client commit and return the layout upon truncate to
 112          * a smaller size */
 113         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 114         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 115         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 116         PNFS_LAYOUTGET_ON_OPEN          = 1 << 3,
 117 };
 118
 119 struct nfs4_deviceid_node;
 120
 121 /* Per-layout driver specific registration structure */
 122 struct pnfs_layoutdriver_type {
 123         struct list_head pnfs_tblid;
 124         const u32 id;
 125         const char *name;
 126         struct module *owner;
 127         unsigned flags;
 128         unsigned max_deviceinfo_size;
 129         unsigned max_layoutget_response;
 130
 131         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 132         int (*clear_layoutdriver) (struct nfs_server *);
 133
 134         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 135         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 136
 137         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 138         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 139         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 140                         struct pnfs_layout_segment *lseg,
 141                         struct list_head *free_me);
 142
 143         void (*return_range) (struct pnfs_layout_hdr *lo,
 144                               struct pnfs_layout_range *range);
 145
 146         /* test for nfs page cache coalescing */
 147         const struct nfs_pageio_ops *pg_read_ops;
 148         const struct nfs_pageio_ops *pg_write_ops;
 149
 150         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 151         void (*mark_request_commit) (struct nfs_page *req,
 152                                      struct pnfs_layout_segment *lseg,
 153                                      struct nfs_commit_info *cinfo,
 154                                      u32 ds_commit_idx);
 155         void (*clear_request_commit) (struct nfs_page *req,
 156                                       struct nfs_commit_info *cinfo);
 157         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 158                                   int max);
 159         void (*recover_commit_reqs) (struct list_head *list,
 160                                      struct nfs_commit_info *cinfo);
 161         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 162                                                 struct page *page);
 163         int (*commit_pagelist)(struct inode *inode,
 164                                struct list_head *mds_pages,
 165                                int how,
 166                                struct nfs_commit_info *cinfo);
 167
 168         int (*sync)(struct inode *inode, bool datasync);
 169
 170         /*
 171          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 172          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 173          */
 174         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 175         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 176
 177         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 178         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 179                         (struct nfs_server *server, struct pnfs_device *pdev,
 180                         gfp_t gfp_flags);
 181
 182         int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
 183
 184         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 185         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 186         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 187 };
 188
 189 struct pnfs_layout_hdr {
 190         refcount_t              plh_refcount;
 191         atomic_t                plh_outstanding; /* number of RPCs out */
 192         struct list_head        plh_layouts;   /* other client layouts */
 193         struct list_head        plh_bulk_destroy;
 194         struct list_head        plh_segs;      /* layout segments list */
 195         struct list_head        plh_return_segs; /* invalid layout segments */
 196         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 197         unsigned long           plh_retry_timestamp;
 198         unsigned long           plh_flags;
 199         nfs4_stateid            plh_stateid;
 200         u32                     plh_barrier; /* ignore lower seqids */
 201         u32                     plh_return_seq;
 202         enum pnfs_iomode        plh_return_iomode;
 203         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 204         const struct cred       *plh_lc_cred; /* layoutcommit cred */
 205         struct inode            *plh_inode;
 206 };
 207
 208 struct pnfs_device {
 209         struct nfs4_deviceid dev_id;
 210         unsigned int  layout_type;
 211         unsigned int  mincount;
 212         unsigned int  maxcount; /* gdia_maxcount */
 213         struct page **pages;
 214         unsigned int  pgbase;
 215         unsigned int  pglen;    /* reply buffer length */
 216         unsigned char nocache : 1;/* May not be cached */
 217 };
 218
 219 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 220
 221 struct pnfs_devicelist {
 222         unsigned int            eof;
 223         unsigned int            num_devs;
 224         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 225 };
 226
 227 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 228 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 229
 230 /* nfs4proc.c */
 231 extern size_t max_response_pages(struct nfs_server *server);
 232 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 233                                    struct pnfs_device *dev,
 234                                    const struct cred *cred);
 235 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
 236 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 237
 238 /* pnfs.c */
 239 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 240 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 241
 242 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
 243 void unset_pnfs_layoutdriver(struct nfs_server *);
 244 void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
 245 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 246 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 247 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 248                                 struct nfs_page *req, u64 wb_size);
 249 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 250 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 251 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 252                             struct nfs_page *prev, struct nfs_page *req);
 253 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 254 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 255 void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
 256 void pnfs_free_lseg_list(struct list_head *tmp_list);
 257 void pnfs_destroy_layout(struct nfs_inode *);
 258 void pnfs_destroy_all_layouts(struct nfs_client *);
 259 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 260                 struct nfs_fsid *fsid,
 261                 bool is_recall);
 262 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 263                 bool is_recall);
 264 bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst,
 265                 struct pnfs_layout_range *dst_range,
 266                 struct inode *inode);
 267 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 268 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 269                              const nfs4_stateid *new,
 270                              bool update_barrier);
 271 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 272                                 struct list_head *tmp_list,
 273                                 const struct pnfs_layout_range *recall_range,
 274                                 u32 seq);
 275 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 276                                 struct list_head *tmp_list,
 277                                 const struct pnfs_layout_range *recall_range,
 278                                 u32 seq);
 279 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 280                 struct list_head *lseg_list);
 281 bool pnfs_roc(struct inode *ino,
 282                 struct nfs4_layoutreturn_args *args,
 283                 struct nfs4_layoutreturn_res *res,
 284                 const struct cred *cred);
 285 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 286                 struct nfs4_layoutreturn_res *res,
 287                 int ret);
 288 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 289 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 290 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 291 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 292 int pnfs_generic_sync(struct inode *inode, bool datasync);
 293 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 294 int _pnfs_return_layout(struct inode *);
 295 int pnfs_commit_and_return_layout(struct inode *);
 296 void pnfs_ld_write_done(struct nfs_pgio_header *);
 297 void pnfs_ld_read_done(struct nfs_pgio_header *);
 298 void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 299 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 300                                                struct nfs_open_context *ctx,
 301                                                loff_t pos,
 302                                                u64 count,
 303                                                enum pnfs_iomode iomode,
 304                                                bool strict_iomode,
 305                                                gfp_t gfp_flags);
 306 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
 307                 const nfs4_stateid *arg_stateid,
 308                 const struct pnfs_layout_range *range,
 309                 const nfs4_stateid *stateid);
 310
 311 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 312                    struct pnfs_layout_segment *lseg,
 313                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 314                            const struct pnfs_layout_range *old),
 315                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 316                            struct pnfs_layout_segment *old),
 317                    struct list_head *free_me);
 318
 319 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 320 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 321 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 322 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 323 void pnfs_error_mark_layout_for_return(struct inode *inode,
 324                                        struct pnfs_layout_segment *lseg);
 325 /* nfs4_deviceid_flags */
 326 enum {
 327         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 328         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 329         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 330 };
 331
 332 /* pnfs_dev.c */
 333 struct nfs4_deviceid_node {
 334         struct hlist_node               node;
 335         struct hlist_node               tmpnode;
 336         const struct pnfs_layoutdriver_type *ld;
 337         const struct nfs_client         *nfs_client;
 338         unsigned long                   flags;
 339         unsigned long                   timestamp_unavailable;
 340         struct nfs4_deviceid            deviceid;
 341         struct rcu_head                 rcu;
 342         atomic_t                        ref;
 343 };
 344
 345 struct nfs4_deviceid_node *
 346 nfs4_find_get_deviceid(struct nfs_server *server,
 347                 const struct nfs4_deviceid *id, const struct cred *cred,
 348                 gfp_t gfp_mask);
 349 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 350 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 351                              const struct nfs4_deviceid *);
 352 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 353 void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
 354 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 355 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 356 void nfs4_deviceid_purge_client(const struct nfs_client *);
 357
 358 /* pnfs_nfs.c */
 359 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 360                                        struct nfs_commit_info *cinfo);
 361 void pnfs_generic_commit_release(void *calldata);
 362 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 363 void pnfs_generic_rw_release(void *data);
 364 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 365                                       struct nfs_commit_info *cinfo);
 366 int pnfs_generic_commit_pagelist(struct inode *inode,
 367                                  struct list_head *mds_pages,
 368                                  int how,
 369                                  struct nfs_commit_info *cinfo,
 370                                  int (*initiate_commit)(struct nfs_commit_data *data,
 371                                                         int how));
 372 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 373 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 374 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 375 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 376                                       gfp_t gfp_flags);
 377 void nfs4_pnfs_v3_ds_connect_unload(void);
 378 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 379                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 380                           unsigned int retrans, u32 version, u32 minor_version);
 381 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 382                                                  struct xdr_stream *xdr,
 383                                                  gfp_t gfp_flags);
 384 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 385                                      struct pnfs_layout_segment *lseg,
 386                                      struct nfs_commit_info *cinfo,
 387                                      u32 ds_commit_idx);
 388 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 389                          struct nfs_open_context *ctx);
 390 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
 391                        struct nfs_open_context *ctx);
 392 void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
 393
 394 static inline bool nfs_have_layout(struct inode *inode)
 395 {
 396         return NFS_I(inode)->layout != NULL;
 397 }
 398
 399 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 400 {
 401         return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
 402 }
 403
 404 static inline struct nfs4_deviceid_node *
 405 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 406 {
 407         atomic_inc(&d->ref);
 408         return d;
 409 }
 410
 411 static inline struct pnfs_layout_segment *
 412 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 413 {
 414         if (lseg) {
 415                 refcount_inc(&lseg->pls_refcount);
 416                 smp_mb__after_atomic();
 417         }
 418         return lseg;
 419 }
 420
 421 static inline bool
 422 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 423 {
 424         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 425 }
 426
 427 /* Return true if a layout driver is being used for this mountpoint */
 428 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 429 {
 430         return nfss->pnfs_curr_ld != NULL;
 431 }
 432
 433 static inline int
 434 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 435                  struct nfs_commit_info *cinfo)
 436 {
 437         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 438                 return PNFS_NOT_ATTEMPTED;
 439         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 440 }
 441
 442 static inline struct pnfs_ds_commit_info *
 443 pnfs_get_ds_info(struct inode *inode)
 444 {
 445         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 446
 447         if (ld == NULL || ld->get_ds_info == NULL)
 448                 return NULL;
 449         return ld->get_ds_info(inode);
 450 }
 451
 452 static inline void
 453 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 454 {
 455         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 456 }
 457
 458 static inline bool
 459 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 460                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 461 {
 462         struct inode *inode = d_inode(nfs_req_openctx(req)->dentry);
 463         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 464
 465         if (lseg == NULL || ld->mark_request_commit == NULL)
 466                 return false;
 467         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 468         return true;
 469 }
 470
 471 static inline bool
 472 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 473 {
 474         struct inode *inode = d_inode(nfs_req_openctx(req)->dentry);
 475         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 476
 477         if (ld == NULL || ld->clear_request_commit == NULL)
 478                 return false;
 479         ld->clear_request_commit(req, cinfo);
 480         return true;
 481 }
 482
 483 static inline int
 484 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 485                        int max)
 486 {
 487         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 488                 return 0;
 489         else
 490                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 491 }
 492
 493 static inline struct nfs_page *
 494 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 495                         struct page *page)
 496 {
 497         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 498
 499         if (ld == NULL || ld->search_commit_reqs == NULL)
 500                 return NULL;
 501         return ld->search_commit_reqs(cinfo, page);
 502 }
 503
 504 /* Should the pNFS client commit and return the layout upon a setattr */
 505 static inline bool
 506 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 507 {
 508         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 509                 return false;
 510         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 511                 PNFS_LAYOUTRET_ON_SETATTR;
 512 }
 513
 514 static inline bool
 515 pnfs_ld_read_whole_page(struct inode *inode)
 516 {
 517         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 518                 return false;
 519         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 520 }
 521
 522 static inline int
 523 pnfs_sync_inode(struct inode *inode, bool datasync)
 524 {
 525         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 526                 return 0;
 527         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 528 }
 529
 530 static inline bool
 531 pnfs_layoutcommit_outstanding(struct inode *inode)
 532 {
 533         struct nfs_inode *nfsi = NFS_I(inode);
 534
 535         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 536                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 537 }
 538
 539 static inline int pnfs_return_layout(struct inode *ino)
 540 {
 541         struct nfs_inode *nfsi = NFS_I(ino);
 542         struct nfs_server *nfss = NFS_SERVER(ino);
 543
 544         if (pnfs_enabled_sb(nfss) && nfsi->layout) {
 545                 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
 546                 return _pnfs_return_layout(ino);
 547         }
 548
 549         return 0;
 550 }
 551
 552 static inline bool
 553 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 554                    struct nfs_server *nfss)
 555 {
 556         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 557                                         nfss->pnfs_curr_ld->id == src->l_type);
 558 }
 559
 560 static inline u64
 561 pnfs_calc_offset_end(u64 offset, u64 len)
 562 {
 563         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 564                 return NFS4_MAX_UINT64;
 565         return offset + len - 1;
 566 }
 567
 568 static inline u64
 569 pnfs_calc_offset_length(u64 offset, u64 end)
 570 {
 571         if (end == NFS4_MAX_UINT64 || end <= offset)
 572                 return NFS4_MAX_UINT64;
 573         return 1 + end - offset;
 574 }
 575
 576 static inline void
 577 pnfs_copy_range(struct pnfs_layout_range *dst,
 578                 const struct pnfs_layout_range *src)
 579 {
 580         memcpy(dst, src, sizeof(*dst));
 581 }
 582
 583 static inline u64
 584 pnfs_end_offset(u64 start, u64 len)
 585 {
 586         if (NFS4_MAX_UINT64 - start <= len)
 587                 return NFS4_MAX_UINT64;
 588         return start + len;
 589 }
 590
 591 /*
 592  * Are 2 ranges intersecting?
 593  *   start1                             end1
 594  *   [----------------------------------)
 595  *                                start2           end2
 596  *                                [----------------)
 597  */
 598 static inline bool
 599 pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
 600 {
 601         return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
 602                 (end2 == NFS4_MAX_UINT64 || start1 < end2);
 603 }
 604
 605 static inline bool
 606 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
 607                 const struct pnfs_layout_range *l2)
 608 {
 609         u64 end1 = pnfs_end_offset(l1->offset, l1->length);
 610         u64 end2 = pnfs_end_offset(l2->offset, l2->length);
 611
 612         return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
 613 }
 614
 615 static inline bool
 616 pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
 617 {
 618         u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
 619         u64 req_last = req_offset(req) + req->wb_bytes;
 620
 621         return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
 622                                 req_offset(req), req_last);
 623 }
 624
 625 extern unsigned int layoutstats_timer;
 626
 627 #ifdef NFS_DEBUG
 628 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 629 #else
 630 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 631 {
 632 }
 633
 634 #endif /* NFS_DEBUG */
 635 #else  /* CONFIG_NFS_V4_1 */
 636
 637 static inline bool nfs_have_layout(struct inode *inode)
 638 {
 639         return false;
 640 }
 641
 642 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 643 {
 644 }
 645
 646 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 647 {
 648 }
 649
 650 static inline struct pnfs_layout_segment *
 651 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 652 {
 653         return NULL;
 654 }
 655
 656 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 657 {
 658 }
 659
 660 static inline int pnfs_return_layout(struct inode *ino)
 661 {
 662         return 0;
 663 }
 664
 665 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 666 {
 667         return 0;
 668 }
 669
 670 static inline bool
 671 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 672 {
 673         return false;
 674 }
 675
 676 static inline bool
 677 pnfs_ld_read_whole_page(struct inode *inode)
 678 {
 679         return false;
 680 }
 681
 682 static inline int
 683 pnfs_sync_inode(struct inode *inode, bool datasync)
 684 {
 685         return 0;
 686 }
 687
 688 static inline bool
 689 pnfs_layoutcommit_outstanding(struct inode *inode)
 690 {
 691         return false;
 692 }
 693
 694
 695 static inline bool
 696 pnfs_roc(struct inode *ino,
 697                 struct nfs4_layoutreturn_args *args,
 698                 struct nfs4_layoutreturn_res *res,
 699                 const struct cred *cred)
 700 {
 701         return false;
 702 }
 703
 704 static inline void
 705 pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 706                 struct nfs4_layoutreturn_res *res,
 707                 int ret)
 708 {
 709 }
 710
 711 static inline bool
 712 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 713 {
 714         return false;
 715 }
 716
 717 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 718                                          const struct nfs_fh *mntfh,
 719                                          struct nfs_fsinfo *fsinfo)
 720 {
 721 }
 722
 723 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 724 {
 725 }
 726
 727 static inline int
 728 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 729                  struct nfs_commit_info *cinfo)
 730 {
 731         return PNFS_NOT_ATTEMPTED;
 732 }
 733
 734 static inline struct pnfs_ds_commit_info *
 735 pnfs_get_ds_info(struct inode *inode)
 736 {
 737         return NULL;
 738 }
 739
 740 static inline bool
 741 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 742                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 743 {
 744         return false;
 745 }
 746
 747 static inline bool
 748 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 749 {
 750         return false;
 751 }
 752
 753 static inline int
 754 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 755                        int max)
 756 {
 757         return 0;
 758 }
 759
 760 static inline struct nfs_page *
 761 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 762                         struct page *page)
 763 {
 764         return NULL;
 765 }
 766
 767 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 768 {
 769         return 0;
 770 }
 771
 772 static inline bool
 773 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 774                    struct nfs_server *nfss)
 775 {
 776         return false;
 777 }
 778
 779 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 780 {
 781         return NULL;
 782 }
 783
 784 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 785 {
 786 }
 787
 788 static inline bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst,
 789                 struct pnfs_layout_range *dst_range,
 790                 struct inode *inode)
 791 {
 792         return false;
 793 }
 794
 795 static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 796                 struct nfs_open_context *ctx)
 797 {
 798 }
 799
 800 static inline void pnfs_parse_lgopen(struct inode *ino,
 801                 struct nfs4_layoutget *lgp,
 802                 struct nfs_open_context *ctx)
 803 {
 804 }
 805
 806 static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
 807 {
 808 }
 809
 810 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 811 {
 812         return false;
 813 }
 814
 815 #endif /* CONFIG_NFS_V4_1 */
 816
 817 #if IS_ENABLED(CONFIG_NFS_V4_2)
 818 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 819 #else
 820 static inline int
 821 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 822 {
 823         return 0;
 824 }
 825 #endif
 826
 827 #endif /* FS_NFS_PNFS_H */